Finding the Fourth Proportional to 9,900.51, 13,646.43 and 7,907.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.51 : 13,646.43 = 7,907.55 : x
2. Step 2: Convert to fraction form
   9,900.51/13,646.43 = 7,907.55/x
3. Step 3: Cross multiply
   9,900.51x = 13,646.43 × 7,907.55
4. Step 4: Simplify right side
   9,900.51x = 107,909,827.55
5. Step 5: Solve for x
   x = 107,909,827.55/9,900.51
6. Step 6: Final answer
   x = 10,899.42